I am not surprised. Having worked at Disney, I expected that there would be a segment of the visitor population who would be taking out their frustration on the front line workers. I remember being yelled at for -- among other things -- the prices being too high, the fact that Florida state law did not permit smoking in dining areas, and the menu selection not being to people's liking. For me, it was excellent training for my current job as an attorney because I can take heaps of abuse without cracking any sort of facial expression. (The fact that there are so many attorneys who think shouting insults counts as legal argument is a separate issue).
But I think in this case, the abuse of team members is just another reason why management needs to move quickly to fix the issue. It really isn't fair to staff to put them in a position where they can't do their jobs in a way that leads to guest satisfaction.